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Built 2026-10-19 (19 October 2026)

Snoqualmie Pass Threshold Days by Year (USC00457781)

15 fixed thresholds counted per year at Snoqualmie Pass (USC00457781): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Snoqualmie Pass Thresholds

  • Snoqualmie Pass: days with 10 mm (0.39 in) or more of precipitation in 38 years, most in 1955 with 111.
  • Snoqualmie Pass: days with 25 mm (0.98 in) or more of precipitation in 38 years, most in 1932 with 53.
  • Snoqualmie Pass: days with 50 mm (1.97 in) or more of precipitation in 38 years, most in 1933 with 15.
  • Snoqualmie Pass: days with a maximum temperature at or below 0 C (32 F) in 37 years, most in 1937 with 64.
  • 15 fixed thresholds have at least one qualifying day at Snoqualmie Pass.
32 years with a qualifying day
Days at or above 30 C (86 F) per year at Snoqualmie Pass Days per year at Snoqualmie Pass with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 14 in 1938. 0510151916: 21922: 11923: 11924: 41925: 51926: 41927: 11928: 41931: 31933: 21937: 31938: 141939: 51940: 51941: 61942: 141943: 31944: 51955: 31956: 61957: 11958: 71959: 41960: 71961: 121963: 41965: 51966: 21967: 101968: 31969: 11970: 619161925193119391943195719611967
Days per year at Snoqualmie Pass with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 14 in 1938.
Days at or above 30 C (86 F) per year at Snoqualmie Pass
YearDaysDecade average
191622
192212.9
192312.9
192442.9
192552.9
192642.9
192712.9
192842.9
193135.4
193325.4
193735.4
1938145.4
193955.4
194056.6
194166.6
1942146.6
194336.6
194456.6
195534.2
195664.2
195714.2
195874.2
195944.2
196075.5
1961125.5
196345.5
196555.5
196625.5
1967105.5
196835.5
196915.5
197066
First to last qualifying date each year at Snoqualmie Pass For each year, a bar from the first to the last day at Snoqualmie Pass meeting 30 C (86 F). 1916: 24 August 1916 to 25 August 19161922: 2 July 1922 to 2 July 19221923: 15 August 1923 to 15 August 19231924: 30 June 1924 to 1 September 19241925: 24 June 1925 to 19 August 19251926: 24 June 1926 to 11 July 19261927: 23 July 1927 to 23 July 19271928: 23 July 1928 to 2 September 19281931: 9 July 1931 to 21 July 19311933: 16 July 1933 to 16 August 19331937: 28 June 1937 to 14 September 19371938: 13 July 1938 to 17 September 19381939: 26 July 1939 to 21 August 19391940: 11 June 1940 to 9 September 19401941: 13 July 1941 to 7 August 19411942: 29 June 1942 to 24 September 19421943: 24 July 1943 to 10 September 19431944: 18 July 1944 to 11 September 19441955: 7 August 1955 to 6 September 19551956: 9 July 1956 to 22 August 19561957: 14 September 1957 to 14 September 19571958: 27 July 1958 to 7 September 19581959: 20 June 1959 to 31 July 19591960: 6 July 1960 to 10 August 19601961: 15 June 1961 to 19 August 19611963: 8 August 1963 to 10 September 19631965: 29 July 1965 to 2 August 19651966: 23 August 1966 to 21 September 19661967: 17 June 1967 to 31 August 19671968: 2 July 1968 to 4 July 19681969: 17 June 1969 to 17 June 19691970: 2 June 1970 to 18 July 197019161925193119391943195719611967JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Snoqualmie Pass meeting 30 C (86 F).
First to last qualifying date each year at Snoqualmie Pass
YearFirst dateLast date
19161916-08-241916-08-25
19221922-07-021922-07-02
19231923-08-151923-08-15
19241924-06-301924-09-01
19251925-06-241925-08-19
19261926-06-241926-07-11
19271927-07-231927-07-23
19281928-07-231928-09-02
19311931-07-091931-07-21
19331933-07-161933-08-16
19371937-06-281937-09-14
19381938-07-131938-09-17
19391939-07-261939-08-21
19401940-06-111940-09-09
19411941-07-131941-08-07
19421942-06-291942-09-24
19431943-07-241943-09-10
19441944-07-181944-09-11
19551955-08-071955-09-06
19561956-07-091956-08-22
19571957-09-141957-09-14
19581958-07-271958-09-07
19591959-06-201959-07-31
19601960-07-061960-08-10
19611961-06-151961-08-19
19631963-08-081963-09-10
19651965-07-291965-08-02
19661966-08-231966-09-21
19671967-06-171967-08-31
19681968-07-021968-07-04
19691969-06-171969-06-17
19701970-06-021970-07-18

Every Fixed Threshold

Fixed thresholds at Snoqualmie Pass
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days321419386
35 C (95 F): Days6519381
90 F (32.2 C): Days181019381
100 F (37.8 C): Days1219382
0 C (32 F): Ice days (max3764193747
0 C (32 F): Frost days (min372121921190
-10 C (14 F): Days with min3738192211
-20 C (-4 F): Days with min17719243
10 mm (0.39 in): Days with 10 mm or more rain38111195578
25 mm (0.98 in): Days with 25 mm or more rain3853193228
50 mm (1.97 in): Days with 50 mm or more rain381519334
100 mm (3.94 in): Days with 100 mm or more rain13519331
10 cm (3.9 in): Days with 10 cm or more snowfall3274195554
25 cm (9.8 in): Days with 25 cm or more snowfall3232195522
50 cm (19.7 in): Days with 50 cm or more snowfall19719644

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1916.

Download the Data

  • Data for Snoqualmie Pass threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).